DTC Detecting Condition and Trouble Area

WARNING: This page is about a different car, the 2011 Suzuki SX4. However, it is still accessible from the selected car via links, so may be relevant.

DIAGNOSTIC INFORMATION AND PROCEDURES REFERENCE CHART

DTC detecting condition	Trouble area
P0171: System Too Lean Total fuel trim (short term fuel trim + long term fuel trim + (A/F sensor signal - targeted A/F sensor feedback)) is higher than specified value for 30 sec. when fuel system is closed loop. (2 D/C detection logic)	Exhaust system Air intake system Fuel system MAF sensor and/or its circuit ECT sensor and/or its circuit A/F sensor and/or its circuit ECM
P0172: System Too Rich Total fuel trim (short term fuel trim + long term fuel trim + (A/F sensor signal - targeted A/F sensor feedback)) is lower than specified value for 30 sec. when fuel system is closed loop. (2 D/C detection logic)